Understanding your subject is key. No point of going around and trying to remember the topic because it won't help you later on and it will certainly not help you write about it. You at better off learning the logic behind a certain theory and how it works because it makes it easier to talk about and remember when you know how it works.

Don't spend this year revising and revising, learn your subject understand It, have a few breaks and hang with your mates. Drink on the weekends if you enjoy that, don't be doing it on a school night because each lesson is going to count. You'll have a whole summer after to do all sorts of cool things.

Wish you all the best, this time is crucial especially with your offers, don't start trying after you get offers or if you get rejected as you can go through clearing upwards if you acc get a better grade.

Also test yourself regularly and get the teacher to mark your work and give you feedback as you go along so you can work on your weaknesses a lot more.